CN101867093A - Ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna - Google Patents

Ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna Download PDF

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CN101867093A
CN101867093A CN 201010199159 CN201010199159A CN101867093A CN 101867093 A CN101867093 A CN 101867093A CN 201010199159 CN201010199159 CN 201010199159 CN 201010199159 A CN201010199159 A CN 201010199159A CN 101867093 A CN101867093 A CN 101867093A
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metal
microstrip patch
shaped
shaped metal
double
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CN 201010199159
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CN101867093B (en )
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何怡刚
唐志军
詹杰
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湖南大学
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Abstract

The invention relates to an ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna, comprising a metal radiating element I, a metal radiating element II, a double T-shaped metal feedback ring and a tabulate insulating medium substrate. A U-shaped metal micro-strip patch mode is adopted for the metal radiating element I, and a non-isometric broken line type metal micro-strip patch mode is adopted for the metal element II. The tabulate insulating medium substrate is arranged below the metal radiating element I and the metal radiating element II. The double T-shaped metal feedback ring is positioned between the U-shaped metal micro-strip patch and the non-isometric broken line type metal micro-strip patch, and the center of the double T-shaped metal feedback ring is positioned on the center lines of the U-shaped metal micro-strip patch and the non-isometric broken line type metal micro-strip patch. The double T-shaped metal feedback ring, the U-shaped micro-strip patch and the non-isometric broken line type metal micro-strip patch are positioned on the same plane, and the an antenna feed position is located at the tail end of the double T-shaped metal feedback ring. The invention has the advantages of simple stricture, wide broadband, high gain, quasi circular polarization, adjustable working frequency, easy machining and low cost.

Description

一种超高频宽带准圆极化微带贴片天线 An ultra high frequency broadband quasi-circularly polarized microstrip antenna

技术领域 FIELD

[0001] 本发明属于非接触式自动识别技术领域,具体地说,是涉及一种适用于无源射频识别系统中的标签天线,尤其是涉及一种具有双T形金属反馈环的超高频宽带准圆极化微带贴片天线。 [0001] The present invention is in a non-contact automatic identification technology, and more particularly, to a suitable passive radio frequency identification tag antenna system, and more particularly to UHF double-T-shaped metal having a feedback loop broadband quasi-circular polarization microstrip patch antenna.

背景技术 Background technique

[0002] 射频识别(RFID)技术作为快速、实时、准确采集和处理信息的高新技术和信息标准化的基础,已经被公认为21世纪十大重要技术之一。 [0002] Radio Frequency Identification (RFID) technology as a rapid, real-time, accurate collection and processing of high-tech information and standardized basis, has been recognized as one of the ten important technologies of the 21st century. 在应用前景上,商业、企业,甚至政府都将新兴的RFID看作为一个普遍的、无处不在的自动识别技术。 On prospects, business, corporate, government and even the emerging RFID will be seen as a universal, ubiquitous automatic identification technology. RFID是一种非接触式自动识别和数据采集技术,操作无需人工干预,在生产、零售、物流、交通等各个行业有着广阔的应用前景。 RFID is a non-contact automatic identification and data capture techniques, operating without human intervention, has broad application prospects in various industries manufacturing, retail, logistics, transportation and so on. 射频识别系统通常由阅读器和标签组成,而天线是标签的核心组件。 RFID systems are usually composed by a reader and the tag, the tag antenna is a core component.

[0003] 现有超高频RFID微带贴片天线结构通常有:方形贴片切角、单一T形匹配、单一感应反馈环匹配、共面倒F形和曲折型偶极子等天线结构。 [0003] Existing UHF RFID patch antenna structures generally are: square patch cut angle, a T-shaped single match, a single match sense feedback loop, coplanar and inverted F-type meander dipole antenna structure and the like. 单一T形匹配天线结构由于具有较大的输入电阻值,因而与具有较小电阻特性的标签芯片匹配会变得十分困难,也就是说其不能满足与具有高阻抗相位角的标签芯片直接相匹配的要求。 Single T-shaped structure due to the matching of the antenna having a large input resistance, and thus matching with the tag chip has a smaller resistance characteristics becomes very difficult, that is to say it can not meet the high impedance having a phase angle of the tag chip directly match requirements. 单一感应反馈环匹配天线结构,仅对具有高阻抗相位角的标签微芯片有效,而对其它类型的标签芯片则难以实现调谐。 Single sense feedback loop matching of the antenna structure, only the high impedance phase angle of a microchip tag, but not on other types of tag chip is difficult to achieve tuning. 共面倒F形天线结构和曲折型偶极子天线结构都要求将辐射体折叠一次或多次,且共面倒F型天线结构另需增加一个接地面。 Coplanar and inverted-F antenna structures meander dipole antenna structure requires radiator folded one or more times, coplanar and inverted-F antenna structure is also required to increase a ground plane. 共面倒F天线结构具有的主要优点为:天线阻抗表现为高容抗性,所以特别适用于高容抗性材料上;其次,由于其存在大的接地面,所以也适合用于金属表面环境中;但其不足之处主要为:大的接地面和短路脚的存在使得天线制造起来困难,并且成本较高。 The main advantage of coplanarity inverted-F antenna structure is: antenna impedance showed high capacity of resistance, it is particularly suitable for high volume resistance material; secondly, due to the presence of a large ground plane, it is also suitable for metal surface environment; but insufficient the main point is: there is a large ground plane and a shorting pin so that the antenna is difficult to manufacture, and costly. 与相同高度的直偶极子天线比较,曲折型偶极子天线在减小带宽和降低效率的代价下能取得较小的谐振频率,即在取得相同谐振频率条件下,曲折型天线尺寸要比传统的直线型天线的尺寸小的多,但其远场辐射特性较差。 Compared to the same height of the straight dipole antenna, a meander dipole antenna can be made small in resonance frequency bandwidth and reduce the cost of reducing the efficiency, i.e., at conditions to achieve the same resonance frequency, than the meander type antenna size small size of a conventional linear multi-type antenna, but its poor far field radiation characteristics.

发明内容 SUMMARY

[0004] 为了克服现有技术存在的上述缺陷,本发明提供一种结构简单,尺寸较小,宽带宽,高增益,准圆极化,制造成本低,远场辐射特性较好的超高频宽带圆极化微带贴片天线。 [0004] In order to overcome the above drawbacks of the prior art, the present invention provides a simple structure, small size, wide bandwidth, high gain, quasi-circular polarization, low manufacturing cost, preferably far field radiation characteristics UHF broadband circularly polarized microstrip patch antennas.

[0005] 本发明的技术方案是:其包括金属辐射单元I、金属辐射单元II、双T形金属反馈环、平板状绝缘介质基板,金属辐射单元I采用U形金属微带贴片形式,金属辐射单元II 采用非等距折线型金属微带贴片形式,平板状绝缘介质基板设于金属辐射单元I和金属辐射单元II的下方,双T形金属反馈环处于U形金属微带贴片和非等距折线型金属微带贴片之间,并且双T形金属反馈环中心位于U形金属微带贴片和非等距折线型金属微带贴片的中心线上,双T形金属反馈环、U形金属微带贴片和非等距折线型金属微带贴片处于同一平面,天线馈电位置处于双T形金属反馈环末端。 [0005] aspect of the present invention is: I radiating element comprising a metal, a metal radiating moiety II, double T-shaped metal feedback loop, flat plate-shaped dielectric substrate, using a metal radiating element I in the form of U-shaped metal microstrip patch, metal non-radiating unit II metal microstrip patch isometric broken-line form, plate-shaped dielectric substrate disposed below the metal radiating units I and II of a metal radiating element, double T-shaped metal in a feedback loop and a U-shaped metal microstrip patch BROKEN non-equidistant between the metal microstrip patches, and the double-T-shaped metal center is located in a feedback loop microstrip center line of the U-shaped metal patches fold lines equidistant and non-metal microstrip patches, double T-shaped metal feedback ring, U-shaped metal and non-equidistant fold line microstrip patch type microstrip patch metal in the same plane, the antenna feed position is a double-T-shaped metal end feedback loop.

[0006] 所述平板状绝缘介质基板为矩形,制造材料为环氧树脂板、玻璃纤维板或柔性聚酉旨(FlexiblePolyester)。 [0006] The flat plate-shaped dielectric substrate is rectangular, the manufacturing material is an epoxy resin board, or a flexible glass fiber unitary purpose poly (FlexiblePolyester). [0007] 所述双T形金属反馈环的天线馈电位置上设有焊盘。 [0007] The double-T-shaped metal antenna feed is provided with a feedback loop on the pad locations.

[0008] 所述双T形金属反馈环厚度、U形金属微带贴片厚度和非等距折线型金属微带贴片厚度均相同。 [0008] The feedback loop double T-shaped metal thickness, U-shaped metal microstrip patches are the same thickness and non-isometric broken-line metal microstrip patch thickness.

[0009] 所述U形金属微带贴片和非等距折线型金属微带贴片均可用覆盖于平板状绝缘介质基板表面的铜层代替,以利于降低天线制造成本。 [0009] The U-shaped metal and non-equidistant fold line microstrip patch type microstrip patch metal are available instead of the copper layer overlying the substrate surface of the flat plate-shaped dielectric, the antenna in order to facilitate reducing the manufacturing cost.

[0010] 使用本发明,标签专用芯片置于焊盘上方,由于焊盘的存在,本发明之超高频宽带准圆极化微带贴片天线采用直接馈电形式,不需要任何馈电装置或阻抗匹配网络,以利于进一步使天线小型化,结构简单化,降低制造成本。 [0010] Using the present invention, a dedicated chip placed over the label pad, the pad due to the presence of wideband UHF registration present invention circularly polarized microstrip patch antenna takes the form of direct feed, the feeding apparatus does not require any or impedance matching network, in order to facilitate further antenna downsizing, simplifying the structure, reducing the manufacturing cost.

[0011] 本发明之超高频宽带准圆极化微带贴片天线与传统的标签天线比较,具有结构简单、紧凑,尺寸较小,宽带宽,高增益,准圆极化,工作频率可调,易加工、低成本等优点。 [0011] The present invention UHF broadband quasi-circularly polarized microstrip patch antenna compared to the conventional tag antenna having a simple and compact structure, small size, wide bandwidth, high gain, quasi-circular polarization, operating frequency advantage tone, easy processing and low cost. 本发明不仅具有T形匹配、感应反馈环和折线型天线的优点,而且克服了现有单一T形匹配、单一感应反馈环和倒F共面天线尺寸较大,阻抗带宽,轴比带宽较窄和难以与现有标签芯片匹配的缺陷;与现有其它多级T形匹配、感应反馈环和折线型天线比较,本发明所述的超高频宽带准圆极化微带贴片天线结构比较简单,成本较低,更适用于宽带,高增益,圆极化,结构紧凑、低成本的无源RFID应用。 The present invention is not only a T-shaped matching, and advantages of the broken-line sensing feedback loop antenna, and overcomes the prior single large T-match, a single sensing feedback loop and the inverted-F antenna size coplanar impedance bandwidth, narrower than the bandwidth of the shaft and a defect is difficult to match with conventional tag chip; with other conventional multi-stage T-match, and the line sense feedback loop antenna comparison, the wideband UHF present invention, the quasi-circularly polarized microstrip patch antenna structure is simple, low cost, is more suitable for broadband, high gain, circularly polarized, compact, low-cost passive RFID applications.

附图说明 BRIEF DESCRIPTION

[0012] 图1为本发明实施例天线几何结构主视图; 图2为图1所示实施例天线几何结构俯视图。 [0012] Figure 1 a front view of the antenna geometry embodiment of the present invention; FIG. 2 is a view of an embodiment of the antenna shown in a plan view geometry.

具体实施方式 detailed description

[0013] 以下结合附图和实施例对本发明作进一步说明。 [0013] The present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0014] 参照图1、2,本实施例包括金属辐射单元I、金属辐射单元II、双T形金属反馈环3、平板状绝缘介质基板5,金属辐射单元I采用U形金属微带贴片1形式,金属辐射单元II 采用非等距折线型金属微带贴片2形式,以利于使天线容易调谐,增大带宽,缩减尺寸和实现准圆极化远场辐射特性;平板状绝缘介质基板5设于金属辐射单元I和金属辐射单元II 的下方,双T形金属反馈环3处于U形金属微带贴片1和非等距折线型金属微带贴片2之间,并且双T形金属反馈环中心位于U形金属微带贴片1和非等距折线型金属微带贴片2 的中心线上,双T形金属反馈环3、U形金属微带贴片1和非等距折线型金属微带贴片2处于同一平面,以利于使天线容易调谐,结构更紧凑,实现单层微带贴片天线结构;天线馈电位置4处于双T形金属反馈环3末端。 [0014] Referring to FIGS. 1 and 2, the present embodiment includes a metal radiating unit I, radiating metal moiety II, double T-shaped metal feedback loop 3, plate-shaped dielectric substrate 5, a metal radiating element using U-shaped metal I microstrip patch 1 in the form of a metal radiating element type II non-equidistant metal microstrip patch 2 fold line forms, to facilitate easy tuning of the antenna, the bandwidth is increased, reducing the size and achieve quasi-circularly polarized far field radiation characteristics; flat plate-shaped dielectric substrate 5 is disposed under the metal radiating element I and II of a metal radiating element, double T-shaped metal 3 is in the feedback loop microstrip patch a U-shaped metal and non-metal fold lines equidistant between two microstrip patch, and the double T a feedback loop located in the center of the metal U-shaped metal microstrip patch and a non-metal type microstrip patch fold line equidistant center line 2, a feedback loop double T-shaped metal 3, U-shaped metal microstrip patch and a non-equidistant BROKEN metal microstrip patch 2 in the same plane to facilitate easy tuning of the antenna, more compact, to achieve single microstrip patch antenna structure; in the 4 position of the antenna feeding double T-shaped metal terminal 3 the feedback loop.

[0015] 所述平板状绝缘介质基板5为矩形,制造材料为环氧树脂板、玻璃纤维板或柔性聚酯(FlexiblePolyester)。 [0015] The plate-shaped rectangular dielectric substrate 5, the manufacturing material is an epoxy resin board, or a flexible glass fiber polyester (FlexiblePolyester).

[0016] 所述双T形金属反馈环3的天线馈电位置4上设有焊盘6。 [0016] The T-shaped metal double feedback loop antenna 3 is provided with a feeding pad 6 4 position.

[0017] 所述双T形金属反馈环3厚度、U形金属微带贴片1厚度和非等距折线型金属微带贴片2厚度均相同。 [0017] The double-T-shaped metal thickness feedback loop 3, U-shaped metal thickness of a microstrip patch type metal and non-equidistant fold line microstrip patch 2 are the same thickness.

[0018] 所述U形金属微带贴片1和非等距折线型金属微带贴片2均可用覆盖于平板状绝缘介质基板5表面的铜层代替,以利于降低天线制造成本。 [0018] The U-shaped metal microstrip patch are available instead of the copper layer-shaped insulating plate covering the surface of the dielectric substrate 1 and 5 non-equidistant metal microstrip patch 2 fold line to facilitate reducing the manufacturing cost of the antenna.

[0019] 所述U形金属微带贴片1的长度为L,宽度为W,厚度为Η。 Length [0019] The U-shaped metal microstrip patch 1 is L, width W, and a thickness of Η. ,χ轴方向的宽度为g ;所述非等距折线型金属微带贴片2厚度为H。 , Χ axis direction width G; the non-equidistant fold line metal thickness microstrip patch 2 is H. ,在χ轴方向上与U形金属微带贴片之间的距离为c,在y轴方向上与U形金属微带贴片的距离为k,折线间距为a和b,折线的宽度为s, 嵌入双T形金属反馈环3处的非等距折线型金属微带贴片的间距为m ;双T形金属反馈环3 宽度为t,厚度为H。 , In the axial direction and the distance χ between the U-shaped metal microstrip patch is c, and the y-axis direction in the U-shaped metal microstrip patch a distance k, and a pitch of polyline B, fold line width s, double T-shaped metal embedded in a non-equidistant spacing feedback fold line at the metal ring is 3 m microstrip patch; double T-shaped metal ring 3 width feedback is t, the thickness is H. ,在χ轴方向上与U形金属微带贴片的距离为f,在χ轴方向上与非等距折线型金属微带贴片的距离为d,在y轴方向上与非等距折线型金属微带贴片的距离为η ;天线馈电位置4位于双T形金属反馈环3末端并与双T形金属反馈环3的双臂相距e ; 平板状绝缘介质基板5的长度为L,宽度为W,厚度为Hs。 , Χ in the axial direction of the U-shaped metal microstrip patch distance is f, χ axis direction in the non-equidistant metal microstrip patch fold line a distance d, in the y-axis direction and the non-equidistant fold line metal microstrip patch distance of [eta]; 4 located at the position of the antenna feeding double T-shaped metal terminal 3 and a feedback loop with a feedback loop double T-shaped metal arms 3 apart E; length of the panel-shaped dielectric substrate 5 is L , width W, and thickness Hs. [0020] 通过增大双T形金属反馈环3与非等距折线型金属微带贴片的距离d,增大双T形金属反馈环3宽度t,缩小双T形金属反馈环3与U形金属微带贴片的距离f,增大双T形金属反馈环3与非等距折线型金属微带贴片的距离n,减小U形金属微带贴片与非等距折线型金属微带贴片的距离c,减小非等距折线型金属微带贴片的间距a或b,以及非等距折线型金属微带贴片的宽度s,可以明显降低所述天线的谐振频率,从而有利于减小天线尺寸, 且本发明之超高频宽带准圆极化微带贴片天线的阻抗带宽、增益和远场辐射特性几乎保持不变,通过调整上述参数可使天线工作在全球超高频波段RFID标准(840-960MHZ)。 [0020] Feedback loop 3 and the U-shaped metal by increasing the feedback loop of double-T non-equidistant fold line 3 and the microstrip patch type metal distance d, is increased double T-shaped metal ring 3 width feedback t, double T-shaped metal reduction shaped metal microstrip patch distance f, double T-shaped metal increased feedback loop non-equidistant fold line 3 and the microstrip patch type metal distance n, U-shaped metal microstrip patch reduced and non-equidistant metal mansard microstrip patch distance c, mansard reduce non-equidistant spacing of a microstrip patch metal or b, as well as non-equidistant fold line width of the microstrip patch type metal s, can significantly reduce the resonant frequency of the antenna , thereby facilitating reduced antenna size, and the present invention UHF broadband quasi-circle impedance bandwidth, gain, and far-field radiation polarized microstrip patch antenna characteristics almost unchanged, the antenna can work by adjusting the parameters global UHF band RFID standard (840-960MHZ).

使用本发明,标签专用芯片7置于焊盘6上方,由于焊盘6的存在,本发明之超高频宽带准圆极化微带贴片天线采用直接馈电形式,不需要任何馈电装置或阻抗匹配网络,以利于进一步使天线小型化,结构简单化,降低制造成本。 Use of the present invention, the label dedicated chip 7 is placed above the pad 6, due to the presence of the pad 6, the present invention UHF broadband quasi-circularly polarized microstrip patch antenna takes the form of direct feed, the feeding apparatus does not require any or impedance matching network, in order to facilitate further antenna downsizing, simplifying the structure, reducing the manufacturing cost.

Claims (5)

  1. 一种超高频宽带准圆极化微带贴片天线,包括金属辐射单元Ⅰ、金属辐射单元Ⅱ、双T形金属反馈环、平板状绝缘介质基板,其特征在于,金属辐射单元Ⅰ采用U形金属微带贴片形式,金属辐射单元Ⅱ采用非等距折线型金属微带贴片形式,平板状绝缘介质基板设于金属辐射单元Ⅰ和金属辐射单元Ⅱ的下方,双T形金属反馈环处于U形金属微带贴片和非等距折线型金属微带贴片之间,并且双T形金属反馈环中心位于U形金属微带贴片和非等距折线型金属微带贴片的中心线上,双T形金属反馈环、U形金属微带贴片和非等距折线型金属微带贴片处于同一平面,天线馈电位置处于双T形金属反馈环末端。 An ultra high frequency broadband quasi-circularly polarized microstrip patch antenna, comprising a metal radiating element Ⅰ, Ⅱ metal radiating element, a feedback loop double T-shaped metal, plate-shaped dielectric substrate, wherein the metal radiating element U-Ⅰ shaped metal microstrip patch form, non-metallic radiating elements ⅱ isometric broken-line metal microstrip patch form, plate-shaped dielectric substrate disposed below the metal and metal radiating element ⅰ ⅱ of radiating elements, double T-shaped metal loop feedback in U-shaped metal microstrip patch and a non-metal fold line equidistant between the microstrip patch, and the double-T-shaped metal center is located in a feedback loop microstrip patch U-shaped metal and non-metal fold lines equidistant microstrip patch center line, T-shaped metal double feedback loop, U-shaped metal and non-equidistant fold line microstrip patch type microstrip patch metal in the same plane, the antenna feed position is a double-T-shaped metal end feedback loop.
  2. 2.根据权利要求1所述的超高频宽带准圆极化微带贴片天线,其特征在于,所述平板状绝缘介质基板为矩形,制造材料为环氧树脂板、玻璃纤维板或柔性聚酯。 The UHF broadband quasi-circularly polarized microstrip patch antenna according to claim 1, wherein said dielectric substrate is a plate-shaped rectangular sheet materials of an epoxy resin, a flexible glass fiber or polyethylene ester.
  3. 3.根据权利要求1或2所述的超高频宽带准圆极化微带贴片天线,其特征在于,所双T 形金属反馈环的天线馈电位置上设有焊盘。 The UHF broadband quasi-circle of claim 1 or claim polarized microstrip patch antenna, wherein the pad is provided with double T-shaped metal antenna feed a feedback loop on position.
  4. 4.根据权利要求1或2所述的超高频宽带准圆极化微带贴片天线,其特征在于,所述双T形金属反馈环厚度、U形金属微带贴片厚度和非等距折线型金属微带贴片厚度均相同。 The UHF broadband quasi-circularly polarized microstrip patch antenna of claim 1 or claim 2, wherein said feedback loop double T-shaped metal thickness, U-shaped metal thickness and microstrip patch Non BROKEN metal from the microstrip patch are the same thickness.
  5. 5.根据权利要求1或2所述的超高频宽带准圆极化微带贴片天线,其特征在于,所述U形金属微带贴片和非等距折线型金属微带贴片均用覆盖于平板状绝缘介质基板表面的铜层代替。 The UHF broadband quasi-circularly polarized microstrip patch antenna of claim 1 or claim 2, wherein said U-shaped metal microstrip patch and a non-metal equidistant fold lines are microstrip patch It was replaced with a copper plate-shaped insulating layer covering the surface of the dielectric substrate.
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CN102156850A (en) * 2011-04-22 2011-08-17 湖南大学 UHF (Ultra High Frequency) RFID (Radio Frequency Identification) gateway blind spot testing system and probabilistic forecasting method
CN103050786A (en) * 2011-10-17 2013-04-17 上海华虹计通智能系统股份有限公司 Planar one-way antenna assembly and realizing method thereof

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CN102156850A (en) * 2011-04-22 2011-08-17 湖南大学 UHF (Ultra High Frequency) RFID (Radio Frequency Identification) gateway blind spot testing system and probabilistic forecasting method
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CN103050786A (en) * 2011-10-17 2013-04-17 上海华虹计通智能系统股份有限公司 Planar one-way antenna assembly and realizing method thereof

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